The orbital magnetic moment of a finite piece of matter is expressed in terms of the one-body density matrix as a simple trace. We address a macroscopic system, insulating in the bulk, and we show that its orbital moment is the sum of a bulk term and a surface term, both extensive. The latter only occurs when the transverse conductivity is nonzero and it is due to conducting surface states. Simulations on a model Hamiltonian validate our theory.

Orbital magnetization in insulators: Bulk versus surface

BIANCO, RAFFAELLO;RESTA, Raffaele
2016-01-01

Abstract

The orbital magnetic moment of a finite piece of matter is expressed in terms of the one-body density matrix as a simple trace. We address a macroscopic system, insulating in the bulk, and we show that its orbital moment is the sum of a bulk term and a surface term, both extensive. The latter only occurs when the transverse conductivity is nonzero and it is due to conducting surface states. Simulations on a model Hamiltonian validate our theory.
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https://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.174417
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2910442
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